pyritohedron

noun

py·​ri·​to·​he·​dron

-drən sometimes -ˌdrän

plural pyritohedrons or pyritohedra

: a pentagonal dodecahedron that is a hemihedral form of the isometric system of crystalline symmetry common to pyrite

Word History

Etymology

New Latin, from pyrito- (from International Scientific Vocabulary pyrite) + -hedron

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